Remove The I/O Board With Cable - Lenovo Chromebook C340-15 Hardware Maintenance Manual

Figure 11. Disconnect the fan cable and remove two screws
Screw specifications
M2.0 x 4.0 mm
Step 2. Remove the fan.
Figure 12. Remove the fan
Go to https://support.lenovo.com/partslookup
replacement part:
Fan

Remove the I/O board with cable

Make sure the following FRU (or CRU) have been removed.
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Lenovo Chromebook C340-15 Hardware Maintenance Manual
Number of screws
2
to look up the Lenovo part numbers of the following